PepsiCo says that an advisory partner to activist investor Nelson Peltz's Trian Fund Management will join the beverage and snack food company's board in March. Purchase, N.Y.-based PepsiCo said Friday that its board has elected William R. Johnson, a former chairman and CEO of H.J. Heinz, to a director seat, effective March 23. Peltz, who recommended Johnson for election to PepsiCo's board, praised the move in a joint statement with the company.